Active Storage Pile : A pile of contaminated soil to which soil is currently being added or from which
soil is currently being removed. Activity must have occurred or be anticipated to occur within one hour to be current.

Aeration : Exposure of excavated contaminated soil to the air.

Aeration Depth : The smaller of the following: the actual average depth of contaminated soil; or 6 inches
multiplied by the daily frequency with which soil is turned. The exposed surface area includes the pile of excavated
soil unless the pile is covered.

Aeration Volume : The volume of soil being aerated shall be calculated as follows: the exposed surface
area in square feet shall be multiplied by the aeration depth.

All piping shall be drained and flushed into the tank or other container.

All liquids and sludges shall be removed, to the extent possible, from the tank. It may be necessary to use
a hand pump to remove the bottom few inches of product.

Vapors shall be removed from the tank by either vapor freeing or ventilation.

No person shall ventilate or vapor free a tank containing more than 0.001 gallons of liquid organic compounds
per gallon of tank capacity unless emissions of organic compounds to the atmosphere are controlled by equipment
or control schemes which demonstrate a combined collection and destruction efficiency of 90 percent by weight.
All control equipment and control schemes subject to this section shall have written District approval prior to
operation.

E. Excavation of Contaminated SoilThe person responsible for aeration of any contaminated soil shall provide the District with the following
information no less than 24 hours prior to the spreading or heating of any contaminated soil:

A description of the basis from which these estimates were derived (soil analysis, Soil Vapor Contamination
Assessment, etc.).

The District shall be notified within 24 hours if any of the parameters change. During excavation and aeration,
daily records shall be kept of the total quantity of soil and the organic content of soil that is aerated each
day.

F. Uncontrolled AerationA person shall not aerate contaminated soil at a rate in excess of that specified in Table I for the degree
of organic content. The limitations in Table I apply to the entire facility, and indicate the volume of contaminated
soil that may be added, on any one day, to soil that is already aerating.

Table I
Allowable Rate of Uncontrolled Aeration

ORGANIC CONTENTPPM (weight)

RATE OF UNCONTROLLED AERATIONCubic yards/day

<50

No Limit

50 - 100

600

100 - 500

120

500 - 1000

60

1000 - 2000

30

2000 - 3000

15

3000 - 4000

10

4000 - 5000

8

>5000

0.1

G. Controlled AerationSoil may be aerated at rates exceeding the limitations of Table I provided emissions of organic compounds to
the atmosphere are controlled by equipment or control schemes which demonstrate a combined collection and destruction
efficiency of 90 percent by weight. All control equipment and control schemes subject to this section shall have
written District approval prior to operation.

H. Storage PilesContaminated soil which is not being aerated shall be covered except when soil is being added or removed. No
more than 10 percent of the storage pile or 20 cubic yards may be uncovered at any time without prior consent
of the Control Officer. Any uncovered contaminated soil will be considered to be aerated. The soil may be covered
with a layer of uncontaminated soil no less than six inches deep or it may be covered with a tarp or other covering,
provided no head space where vapors may accumulate is formed.

I. Exemptions

Storage Piles: Calculations of aeration volume shall not include storage piles that are covered nor
shall they include active storage piles.

Excavated Hole: The exposed surface of an excavated hole shall not be included in calculations of aerated
volume.

Sampling: Contaminated soil exposed for the sole purpose of sampling shall not be considered to be aerated.
No more than 10 percent of the contaminated soil or 20 cubic yards may be exposed at any time without
prior consent of the Control Officer. Removal of soil for sampling shall not qualify a pile as "active."

Non-volatile Hydrocarbons: The requirements of this rule shall not apply if the only soil contamination
is by a known organic chemical or petroleum liquid, and that chemical or liquid has an initial boiling point of
302°F or higher, provided that the soil is not heated.

J. Soil SamplingOne composite sample shall be collected and analyzed for every 50 cubic yards of excavated contaminated soil
to be aerated. At least one composite sample shall be collected from each inactive, uncovered storage pile within
24 hours of excavation. Samples are not required if the soil is uncontaminated.

A composite sample shall consist of one sample taken from the center of each of 4 equal sectors of the area
required to be sampled using the procedures described below unless other methods are approved by the Control Officer.

Samples shall be taken from at least three inches below the surface of the pile using a driven-tube type sampler,
capped and sealed with inert materials, and extruded in the lab in order to reduce the loss of volatile materials
or by using a clean brass tube (at least three inches long) driven into the soil with a suitable instrument. The
ends of the brass tube shall then be covered with aluminum foil, then plastic end caps, and finally wrapped with
a suitable tape. The samples shall then be immediately placed on ice, or dry ice, for transport to a laboratory.

K. Measurement of Organic ContentOrganic content of soil shall be determined by the EPA Reference Method 8010 or 8015, Regional Water Quality
Control Board's Revised Analytical Methods, Attachment 2, 11/8/85, or other methods approved by the Control Officer.